Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Building a Counter for HeartBeat

  1. Mar 24, 2009 #1
    I have limited hardware components I can use for this obstacle. Lets say I have precision rectified the input heartbeat signal into a square wave... I am trying to count the number of squarewaves/heartbeats and display them on two 7-segment displays refreshing every 15 seconds...
    I can only use a 4029 Up.dwn counter and a BCD driver to 7 segment display....
    My issue is that the 4029 is going to need to refresh every 15 seconds however !!! the output needs to be in bpm (Beats per minute) which means it is off by a factor of 4... How can i multiply the output by 4 or is there a clever way i can do this with the timer that resets the 4029 every 15 seconds? PLEASE HELP. ive looked everywhere. even minute insight may prove valuable. thanks in advance.
     
  2. jcsd
  3. Mar 24, 2009 #2

    Danger

    User Avatar
    Gold Member

    Hey, Tenacity.
    I can't help you at all; I know nothing about electronics. It does strike me, however, that this might get better participation if you have it moved to Electrical Engineering or maybe even the Computer section.
     
  4. Mar 28, 2009 #3
    How about a counter that updates every second. Put your heartbeat pulse into a 64 bit shift register that shifts every 0.234 second, and you have a up-down counter that keeps track of all the "1" bits in the SR during a continously updating 15 second interval.
     
  5. Mar 28, 2009 #4
    huh , interesting thought, but im not sure i can use a shift register... these are the components i can use....
    4011 CMOS NAND (2 input)
    4029 CMOS UP/DN COUNTER
    4043 RS TYPE FF
    4093 SCHMITT TR NAND
    4511 LED DRIVER
    7 SEGMENT DISPLAY
    7400 NAND (2 Input)
    7402 NOR (2 Input)
    7404 INVERTER
    7408 AND
    7410 NAND (3 Input)
    7420 NAND (4 Input)
    7430 NAND (8 Input)
    7432 OR (2 Input)
    7437 NAND (High current)
    7440 NAND (High current)
    7442 BCD TO 1 OF 10 DECODER
    7474 D TYPE FF
    7476 JK TYPE FF
    7486 EXOR
    7490 DECADE COUNTER
    74151 DATA SELECTOR
    74153 DATA SELECTOR
    324 OP-AMP
    339 OP-AMP
    356 OP-AMP
    741 OP-AMP
    386 AUDIO POWER AMPLIFIER
    555 TIMER
    RED LEDs
    SK3024 PNP BJT
    ZENER DIODE (5V)
    IN914 DIODE

    Im using the 4029 CMOS UP/DN COUNTER with the LED driver that outputs to the LED. any ideas using these components?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Building a Counter for HeartBeat
  1. Building a Tesseract (Replies: 1)

  2. Building Collapses (Replies: 3)

  3. Build a thermistor? (Replies: 1)

  4. Building a ramp (Replies: 4)

  5. Building a periscope (Replies: 2)

Loading...